<fieldset>    
    <?php 
        
        if(isset($content) && count($content) > 0)
        {
            $noidungbaiviet = $content[0]['noidungbaiviet_viet'];
            $tieude = $content[0]['tieude'];
            echo "<legend>$tieude</legend>";
            echo $noidungbaiviet;   
        }   
        else
        {
             echo "<legend>Giới thiệu chung</legend>";
        }     
    ?>    
</fieldset>